If your thermistor, like many others is mounted in a hole, right next to your heat source, inside a metal block, its gonna read hotter than a measurement taken on the surface of you nozzle.
What happened when you tried to Autotune? did it get any where near the set point? Have you got fans pointing at your hotend?
Have you tried to extrude any filament yet with your printer? Either manually by turning the drive gears or controlled through your host software? If so what happens?
=======================================================
A wise man once told me "Never trust a man who doesn't own a shed!"
=======================================================
Gen 6 daughter board
[
forums.reprap.org]
Mendel PCB heatbed
[
forums.reprap.org]
=======================================================